TAB. XXVIII. 



Fig. 

 1. Mya truncata, p. 277. 



a, b, from Coralline Crag, at Raiiisholt. 



c, liar. Uddevallensis. From the Clyde Beds. 



d, (', var. puUus. From the Red Crag-, at Butley. 

 '2. Mya arenaria, p. 279. 



f/, h, from the Red Crag, Sutton. 



d, e, var. lata. From the Red Crag, Snttoii 



c, distorted specimen, from the Mammaliferoiis Crag. Branierton. 



/, cartilage plate of var. lata. 



